Six bells commence tolling together and toll at intervals of 2, 4, 6, 8 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together ?
i am getting 15 but answer given 16
L.cm of all is 120 , the bells will toll together after every 120 seconds(2 minutes).
In 30 minutes, they will toll together 30/2